6.4.2.1 Text Functions

• mode `alpha'(text s, mode x);

  is the base x integral interpretation of s. s is expected some sequence of base x digit characters, possibly prefixed (the sequence, not the characters) by some mix of white spaces and sign characters (minuses and pluses, that is). In bases above 10, the letter `a' in either upper or lower cases represents 10, `b' represents 11, and so forth, with `z' representing 35. x is expected between 2 and 36 inclusive. Or zero, in which case the base is assumed 16 if the digits sequence is immediately prefixed by `0x', 8 if the sequence starts with `0', 10 otherwise.

• real `atof'(text s);

  is the real decimal interpretation of s. s is expected some sequence of decimal digit characters, possibly including a single period sign (`.'), though not in last position, possibly prefixed (the sequence, not the characters) by some mix of white spaces and sign characters (minuses and pluses, that is).

• mode `atoi'(text s);

  is the integral decimal interpretation of s. s is expected some sequence of decimal digit characters, possibly prefixed (the sequence, not the characters) by some mix of white spaces and sign characters (minuses and pluses, that is). Same as `alpha'(s, 10).

• text `bfxa'(mode b, mode f, mode x, mode m);

  is the base x, f digits, b wide comma separated blocks representation of m

• text `cat'(text s1, text s2);

  is the concatenation of s1 and s2

• text `cat2'(text s1, text s2);

  is same as `cat'(s1, s2)

• text `cat3'(text s1, text s2, text s3);

  is the concatenation of s1, s2 and s3

• text `cat4'(text s1, text s2, text s3, text s4);

  is the concatenation of s1, s2, s3 and s4

• text `cut'(text string, mode offset, mode length);

  is the length long string cut from by offset biased string

• text `delete'(text s, mode p);

  is the p indexed character deleted s string (negative position indications are interpreted with respect to the end of string)

• text `insert'(text s, mode p, mode c);

  is the before p indexed character c character inserted s string (negative position indications are interpreted with respect to the end of string)

• text `itoa'(mode m);

  is the decimal representation of m (same as `bfxa'(0, 0, 10, m))